Cheapest return flights from Ontario to Las Vegas in May from $250

AirHint found the following cheapest return flights from Ontario (ONT) to Las Vegas (LAS) in May 2026 (see full year).

Return flights

06 May - 07 May American Airlines
01 May - 09 May Southwest Airlines
13 May - 18 May Southwest Airlines
20 May - 22 May Southwest Airlines
23 May - 25 May Southwest Airlines
14 May - 24 May Southwest Airlines
14 May - 18 May Southwest Airlines
21 May - 21 May Southwest Airlines

Also check the deals for one-way flights from Ontario to Las Vegas in May.

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